Intrinsic Laryngeal muscles innervation and exception
Supplied by recurrent laryngeal nerve except cricothyoroid = external laryngeal nerve (branch of superior laryngeal nerve)
Cricotyhroid Muscle
Action
Innervation
Stretches and tenses vocal fold
External Laryngeal Nerve
Posterior Cricoarytenoid
Action
Innervation
Abducts vocal fold
Recurrent laryngeal Nerve
Lateral cricoarytenoid
Action
Innervation
Adducts vocal fold
Recurrent laryngeal Nerve
Thyroarytenoid
Action
Innervation
Relaxes vocal fold
Recurrent Laryngeal Nerve
Transverse and oblique arytenoids
Action
Innervation
Closes rima glottides
Recurrent Laryngeal Nerve
Vocalis
Relaxes posterior vocal ligament, tenses anterior vocal ligament - Antagonist of cricothyroid muscle
Recurrent laryngeal nerve
Recurrent Laryngeal Nerve
Left = Wraps around aortic arch (ligamentum arteriosum) Right = Wraps around right subclavian
Motor to all intrinsic muscles of larynx (via inferior laryngeal branch) except cricothyroid
Sensory = laryngeal mucosa below vocal folds and upper trachea
Superior Laryngeal Nerve
Branch of vagus right after exit from jugular foramen
Passes through thyrohyoid membrane
External branch = Innervates cricothyroid
Internal branch sensory info to laryngeal mucosa above vocal folds
Contents of Axilla
Axillary Vessels
Brachial Plexus
Biceps Brachii (both heads)
Coracobrachialis
Axillary Artery
After lateral border of first rib (continuation of subclavian)
Close to medial cord of brachial plexus
Posterior to pec minor muscle
Becomes brachial artery after passing inferior border of teres major
Median Nerve (Brachial Plexus)
Lateral and medial cords
C5-T1
Motor = Forearm flexors
Sensory = Anterior arm, lateral palm
Ulnar Nerve (Brachial Plexus)
Medial Cord
C8-T1
Flexors of wrist and fingers = Motor
Sensory = Medial arm/forearm, medial palm
Radial Nerve (Brachial Plexus)
Posterior Cord
C6-C8
Extensors of arms/forearm = motor
Sensory = posterior arm, forearm hand
Musculocutaneous Nerve (Brachial Plexus)
C5-C7
Motor = Arm flexors (Biceps, coracobrachialis, brachialis)
Sensory = Anterolateral arm, forarm
A-alpha nerve fiber
Fastest and biggest
Proprioception and Motor
A-Beta nerve fiber
2nd Fastest and 2nd Biggest
Sensory, Touch, Pressure
A-gamma Nerve Fiber
3rd fastest and 3rd Biggest
Muscle Spindles
A-sigma nerve fiber
4th Fastest and 4th Biggest
Sharp Pain, temperature, touch
B-fiber nerve fiber
5th Fastest and 5th Biggest
Preganglionic autonomic
C-Fiber Nerve Fiber
Slowest
Dull pain, temperature, postganglionic autonomic
Only non-myelinated
